UNCERTAINTIES OF TH/EU AND TH/HF CHRONOMETERS FROM NUCLEAR MASSES

摘要：

The age of the Universe is one of the most important physical quantities in cosmology and it can be determined with the r-process nucleochronometer. Based on the classical r-process model, the r-process abundance patterns and various nuclear chronometers in the metal-poor halo stars are investigated by employing the newly developed nuclear mass models. It is found that the uncertainty of Th/Eu chronometer caused by nuclear mass uncertainties is about 4 Gyr, while the uncertainty of Th/Hf chronometer is so large that it should be taken with caution. With the Th/Eu chronometer, the age of the metal-poor stars CS 31082-001 is determined as 16.3 ±7.1 Gyr, which agrees well with the results derived from Th/U chronometer.

关键词： Nuclear chronometer r-process metal-poor star

作者: Z. M. NIU B. SUN J. MENG

作者单位: State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijin School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China Justus-L State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijin

会议类型: 国际会议

会议名称: The 13th National Conference on Nuclear Structure(第十三届全国核结构研讨会暨第九次全国“核结构与量子力学专题讨论会

会议地点: 赤峰

会议语种:英文

页码: 159-164

在线出版日期: 2010-07-24（万方平台首次上网日期，不代表论文的发表时间）